Aha! Thus, if we ignore in the context of what one experiences as "normal" listening volume, it is the same result that I got, see #5. I don't know what if you know about this, but for others reading this thread.
Measuring distance from the speakers doesn't really matter much because the listening room functions as a reverb chamber.
Try moving the milrophone around the room and you get more or less the same result. Although not very close to the speaker. When that happens, anyone can test with a free dB app. I think the results will surprise.
Edit:
Or not. Everyone intuitively knows how it sounds in an ordinary room, the sound level in different, all, parts of the room.